Functionality of Zinc Anodes in Repaired Concrete Structures

锌阳极是一种有效而又经济的方法，可以减轻钢材腐蚀的有害影响。 钢筋混凝土(RC)结构中嵌入的钢筋。在RC的任何修复补片上使用锌阳极 元素可防止钢材在周围区域发生腐蚀；然而，补丁加速腐蚀 钢筋剥落是一种危急的现象，可能会发生在原混凝土的修补附近 补丁取决于许多参数。影响锌阳极性能的关键因素之一是 埋入阳极的混凝土或水泥基修补材料的电阻率。然而，没有 关于修补材料/混凝土的最大允许电阻率，有可靠的数据 哪些锌阳极不能防止钢的腐蚀。针对这一问题，矢量腐蚀技术公司 有限公司一直在寻找机会进行系统的研究，以最大限度地提高锌的效率 保护钢筋混凝土结构免受腐蚀风险的阳极。因此，这项提议的具体目标是 混凝土电阻率对锌阳极缓蚀加速效率的影响探讨 腐蚀。将在模拟这种情况的平板原型上进行测试，同时改变电阻率 结合不同的阳极板间距对修补混凝土与原粘结线进行比较 混凝土。随着时间的推移，将监测钢筋的腐蚀活性。这项研究将提供至关重要的 关于修补材料/混凝土的电阻率和阳极间距的功能范围的信息，这将 优化经济技术(锌阳极)的效率，以保护嵌入的钢筋免受 腐蚀的风险。在这项研究的长期过程中，可以将实际结果纳入修复 钢筋混凝土结构指南。这项研究的成功将为恢复、维护和维护提供战略解决方案 以及改善重要的基础设施(例如交通基础设施)，以维持 加拿大的经济增长和生活质量。

Zinc anodes are an effective, yet economical, method to mitigate the deleterious effect of corrosion of steel rebars embedded in reinforced concrete (RC) structures. Using zinc anodes at any repaired patch in an RC element prevents the onset of steel corrosion within a surrounding area; however, patch accelerated corrosion of steel rebars is a critical phenomenon that may take place in the original concrete in the vicinity of repaired patches depending on a number of parameters. One of the key factors affecting the efficacy of zinc anodes is the resistivity of concrete or cementitious repair material in which these anodes are embedded. However, no robust data are available on the maximum allowable electrical resistivity of repair materials/concretes beyond which zinc anodes cannot prevent corrosion of steel. In response to this issue, Vector Corrosion Technologies Ltd. has been pursuing opportunities to conduct a systematic research study to maximize the efficiency of zinc anodes at protecting RC structures from the risk of corrosion. Hence, the specific objective of this proposal is to explore the effect of concrete resistivity on the efficiency of zinc anodes at mitigating patch accelerated corrosion. Tests will be done on slab prototypes simulating this scenario, while varying the electrical resistivity of the repair concrete in combination with different anode spacing from the bond line with the original concrete. The corrosion activity of rebars will be monitored with time. This study will provide crucial information on the functional range of resistivity of repair materials/concretes and anode spacing, which will optimize the efficiency of an economical technology (zinc anodes) at protecting embedded reinforcement from the risk of corrosion. Over the long-term of this research, practical outcomes can be incorporated in repair guidelines for RC structures. Success of this research will offer a strategic solution for restoring, maintaining and improving vital infrastructural facilities (e.g. transportation infrastructure) required for sustaining the economic growth and quality of life in Canada.